<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <meta name="description" content="Clamp a point and label to a model using the sampleHeight function.">
    <meta name="cesium-sandcastle-labels" content="Showcases">
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script type="text/javascript" src="../../../Build/CesiumUnminified/Cesium.js" nomodule></script>
    <script type="module" src="../load-cesium-es6.js"></script>
</head>
<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
<style>
    @import url(../templates/bucket.css);
</style>
<div id="cesiumContainer" class="fullSize"></div>
<div id="loadingOverlay"><h1>Loading...</h1></div>
<div id="toolbar"></div>
<script id="cesium_sandcastle_script">
function startup(Cesium) {
    'use strict';
//Sandcastle_Begin
var viewer = new Cesium.Viewer('cesiumContainer', {
    infoBox : false,
    selectionIndicator : false,
    shadows : true,
    shouldAnimate : true
});
var scene = viewer.scene;
scene.globe.depthTestAgainstTerrain = true;

if (!scene.sampleHeightSupported) {
    window.alert('This browser does not support sampleHeight.');
}

var longitude = -2.1480545852753163;
var latitude = 0.7688240036937101;
var range = 0.000002;
var duration = 4.0;

var entity = viewer.entities.add({
    position : Cesium.Cartesian3.fromRadians(longitude, latitude),
    model : {
        uri : '../../SampleData/models/GroundVehicle/GroundVehicle.glb'
    }
});

var point = viewer.entities.add({
    position : new Cesium.CallbackProperty(updatePosition, false),
    point : {
        pixelSize : 10,
        color : Cesium.Color.YELLOW,
        disableDepthTestDistance : Number.POSITIVE_INFINITY
    },
    label : {
        show : false,
        showBackground : true,
        font : '14px monospace',
        horizontalOrigin : Cesium.HorizontalOrigin.LEFT,
        verticalOrigin : Cesium.VerticalOrigin.BOTTOM,
        pixelOffset : new Cesium.Cartesian2(5, 5),
        disableDepthTestDistance : Number.POSITIVE_INFINITY
    }
});

var objectsToExclude = [point];
var cartographic = new Cesium.Cartographic();

function updatePosition(time, result) {
    var offset = (time.secondsOfDay % duration) / duration;
    cartographic.longitude = longitude - range + offset * range * 2.0;
    cartographic.latitude = latitude;

    var height;
    if (scene.sampleHeightSupported) {
        height = scene.sampleHeight(cartographic, objectsToExclude);
    }

    if (Cesium.defined(height)) {
        cartographic.height = height;
        point.label.text = Math.abs(height).toFixed(2).toString() + ' m';
        point.label.show = true;
    } else {
        cartographic.height = 0.0;
        point.label.show = false;
    }

    return Cesium.Cartographic.toCartesian(cartographic, Cesium.Ellipsoid.WGS84, result);
}
viewer.trackedEntity = entity;
//Sandcastle_End
    Sandcastle.finishedLoading();
}
if (typeof Cesium !== 'undefined') {
    window.startupCalled = true;
    startup(Cesium);
}
</script>
</body>
</html>
